How to Remove Seams on Scale Models (Beginner Friendly Guide from AFV Hobby Hub)

Short answer: You remove seams by gluing the joint properly, letting it cure, then sanding, filling (if needed), and polishing until the seam disappears under primer.

Below is the full, detailed workflow.

1. Identify the seam

Seams show up where two halves of a part meet—tank barrels, aircraft fuselages, car bodies, etc. Run your fingernail along the joint; if you feel a ridge, it needs work.

2. Use the right glue technique

For most plastic kits, liquid cement (Tamiya Extra Thin, Mr. Cement S, etc.) is ideal.

Why? It melts the plastic slightly, allowing the two halves to fuse into a single piece.

How to do it:

• Apply cement along the seam.
• Press the parts together firmly until a small bead of melted plastic squeezes out.
• Let it cure at least 12–24 hours.

That squeezed‑out plastic becomes your filler.

3. Scrape the seam

Once cured, use the back of a hobby knife blade to gently scrape the raised seam. This quickly levels the joint without removing too much material.

4. Sand progressively

Start with a medium grit and work your way finer:

• 400–600 grit: remove remaining ridge
• 800–1000 grit: smooth the area
• 1500–2000 grit: polish for paint

Use sanding sticks or sponges to control pressure.

5. Check your work with primer

A light coat of primer reveals flaws instantly. If you still see a line, don’t panic—this is normal.

Sand again or move to the next step.

6. Fill gaps if needed

If the seam is still visible, use one of these fillers:

• Putty (AMMO, Tamiya, Vallejo)
• Putty Surfacer (AMMO)
• CA glue (super glue)
• Sprue Goo (sprue melted in cement)

Apply, let it cure, then sand again.

Tip: CA glue is great for thin seams because it sands very smooth.

7. Restore lost details

Sanding often removes panel lines or rivets. Use a scriber or needle to re‑engrave lines lightly.

This step is what separates “good enough” from “pro‑level.”

8. Final polish before paint

Use a fine sanding sponge or micromesh to blend the repaired area into the surrounding plastic. The surface should feel uniform and smooth.

Common Mistakes to Avoid

• Using thick glue that doesn’t melt the plastic
• Sanding too early before the glue cures
• Skipping primer, which hides nothing
• Over‑sanding, flattening curves or edges

We hope this helps and please add your favorite technics in the comments, AFV Hobby Hub